<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
	</head>
	<body>
		<script>
			// var声明的变量没有块级作用域
			{
				var msg = 'abc'
				console.log('var声明的代码可能msg:', msg)
			}
			console.log('var声明的代码可能msg:', msg)

			for (var i = 0; i < 3; i++) {
				var foo = 'foo'
				console.log('foo :>> ', foo)
			}
			console.log('foo :>> ', foo)
			console.log('i :>> ', i)
		</script>
	</body>
</html>
